Can't get a string parameter into a C# WS from delphi client

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C#

Delphi

webservice

Greetings!

I got a silly question, for I'd like to get some aid. I'm practicing the call of Web Services from Delphi7. I'm testing it with a WS made in C# 2010. That is what I got so far:

This is the Web Service in C#:

public class Service1 : System.Web.Services.WebService
{
    [WebMethod]
    public int countChars(string text)
    {
        int n = 0;
        if (text != null)
            return text.Length;
        else
            return n;
    }
}

This is the Web Client in Delphi (just a form with a button and a SOAP object):

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, InvokeRegistry, Rio, SOAPHTTPClient, StdCtrls, Service1;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Serv: THTTPRIO;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
   size : Integer;
begin
   try
      size := (Serv as Service1Soap).countChars('Hello');
      ShowMessage(IntToStr(size));
   except
      on e:Exception do
      begin
         ShowMessage(e.Message);
      end
   end
end;

end.

The thing is, when I do call the web service, text is received as a null entry, instead of the word "Hello".

What I have tried:

I tried changing to PChar in Delphi. Looking for info on internet. Even read about BTSr but no idea how to use that (I supose that's for COM stuff). I wonder why I keep getting a null string. What am I missing?



Edited: Seems like I'm getting a similar issue with Integers. Tried to do an addittion between 2 numbers (4 and 5) and I get 0 as result.

C# Web Method:

[WebMethod]
public int sumAB(int a, int b)
{ return a + b; }

Delphi call to Method:

procedure TForm1.Button1Click(Sender: TObject);
var
   sum, a, b : Integer;
begin
   a := 5;
   b := 4;
   sum:= (Serv as Service1Soap).sumAB(a,b);
   ShowMessage(IntToStr(sum));
end;